Global Warming is a Local, State, National and International Emergency that Will Only Worsen in Time, Not Get Better
Unfortunately, as the volumes of greenhouse (heat-trapping) gases that are being released to the atmosphere on a daily basis as a result of human activity (mainly from burning coal, natural gas, oil and jet fuel) continue to accumulate there; and Earth’s remaining green space (forests, prairies and other carbon dioxide (CO2) consuming (sequestering) vegetation) is reduced; and Earth’s oceans, seas, the Great Lakes and numerous other water bodies become evermore warmer and saturated with carbon dioxide (CO2), making them more acidic; the prospect of Earth being as hospitable as for life as it has been in the recent millennia in which humans have inhabited this planet is getting slimmer and slimmer.
Scientific studies have been showing for decades, and now with more and more clarity, that modern day living – particularly by residents in the developed countries of the world, who rely so heavily on burning fossil fuels in their daily living – for energy warmth in winter, and electricity generation and transmission, year-round, for shipping goods and trading, and, moreover, for personal or work related travel, the construction, pavement and land alterations that are done which not only allow for that activity, but promote it, that that kind of living by so many millions and even billions of people, will ultimately lead to grave consequences for our planet.
And with our human population continuing to grow geometrically, coupled with the outright refusal of much of the population, their political leaders, and even the recently elected president of our United States of America, Donald J. Trump, continuing to advocate for the highly resource consumptive “business as usual” lifestyle — many human and other lives have already been lost, and people all over the world have suffered, and many more people and animals living in the future will suffer, or be lost, and many trillions of dollars will be lost as well as a result of climate change related “natural” disasters, and rising sea level, a situation which now is not only unprecedented but becoming increasingly dire and predictable.
It’s not like you can just turn the water faucet off and global warming will stop. As stated in Gavin Schmidt and Joshua Wolfe’s comprehensive textbook: “Climate Change – Picture the Science” (2008), it could take centuries and even millennia to reverse it. “even if we act to keep atmospheric concentrations at the same level they are now [atmospheric CO2 concentrations 400 parts per million], the global mean temperature will continue to increase for a few decades as a result of past greenhouse gas emissions [GHGs] and the thermal inertia of the oceans [Water holds heat and releases it much slower than hard surfaces such as cement and asphalt.]”
All we can do now is to slow the pace of global warming by conserving energy obtained either directly or indirectly from burning fossil fuels. Moreover, changing to energy alternatives that don’t add to the rising concentrations of GHGs takes more time and money [but creates more long term jobs], and finding ways to adapt to the changes in the climate and the effects brought about by those changes will also cost money and will hurt the poor and the very young and the more elderly individuals [very young have less body mass to buffer individuals to higher heat; older persons are more susceptible to heat stroke].
“In short, there are no shortcuts to addressing a challenge that is global, pervasive, profound, and long term. Global citizens must grasp the challenge, master its intricacies, and take responsibility, for our own generation, and those to come”.[Jeffrey D. Sachs, New York, 6/16/2008]
Also see “UW-Madison Faculty Challenge DNR Climate Change Revisions”.
The following is from Lee Bergquist of the Milwaukee Journal Sentinel, January 22, 2017:
In a shift from the practice of two other state agencies, Wisconsin emergency management officials have released new information on climate change and its implications for the state.
In a report that it posted online last week, the state Division of Emergency Management devoted extensive attention to climate change and how a warming planet could spur natural disasters such as floods, drought and forest fires.
The report contrasts with the Department of Natural Resources and the state Public Service Commission, which scrubbed mentions of climate change and human-generated greenhouse gases from their websites.
As recently as December, DNR officials removed language from a web page devoted to the Great Lakes that had earlier acknowledged the role humans play in global warming. Officials inserted new wording saying climate change is a matter of scientific debate [Not – true! Truthful scientists will tell you the scientific debate ended years ago. MTN]
The PSC, which regulates electric utilities, eliminated its web page on climate change at some point before May 1, the Milwaukee Journal Sentinel found recently. The scrubbed information included a link to former Gov. Jim Doyle’s task force report on global warming. The Democratic governor’s report in 2008 recommended that Wisconsin reduce the use of fossil fuels and rely more on renewable sources of power. The measures were never enacted.
In the cases of the DNR and the PSC, the information can still be found on the Wayback Machine, an online archive.
In a new five-year disaster preparedness plan, the Division of Emergency Management cites research such as from the Wisconsin Initiative on Climate Change Impacts. It shows global warming is likely to produce more extreme weather. Examples: more days of 90-degree-plus temperatures and more intense rain events.
Bursts of rainfall, the report said, could lead to natural calamities such as flooding, collapse of dams, sinkholes and lake bluff failures.
While other agencies have removed references to the role of human activities in global warming, officials at the Division of Emergency Management included such a statement.
“Although it is widely accepted by the scientific community that the observed changes in global temperatures are the result of human actions, there is considerable uncertainty about the impacts these changes will ultimately have,” the agency wrote.
The document also acknowledges “some debate about the cause of climate change,” but added that statewide temperatures have increased 1.1 degrees in the past 50 years and that more extreme weather events are likely.
The new planning document was approved in December by the Federal Emergency Management Agency, said Lori Getter, spokeswoman for the state Division of Emergency Management.
Wisconsin was one of the first states to complete a new plan. As part of the process, FEMA required states to consider potential climate effects, she said.
Reducing the Current Suicidal Rate of Global Warming and Planning for Adapting to Changing Climates Demands Review of Goals, Principles and Actions by World’s Past Leaders and the Movements and Demonstrations by the People Who Expressed their Demands for Change
Today’s Populations, Businesses and Governments Responsible for Ensuring and Prolonging Earth’s Beauty, Economic Potential, Safety, and Humane Conditions for All It’s People and Animals Ought Not Ignore Leadership, Inspirations, Dreams and Concerted Actions of Millions of People and Leaders Who Lived Before Us, or Are Still Amoung Us, for Help in Music Guidance, Leader
To be continued….
With a Forecast of Sea Level Rising 5-6 Feet Under “Business-as-Usual” Conditions, Media and Others Ought Ask Presidential Contenders What Steps the Country and Its People Ought Be Taking to Reduce this Major Threat to Humanity!
The latest study in the prestigious Journal Nature predicts the world’s oceans will rise 5 or 6 feet by the end of this century without major changes to end fossil fuel burning – NOW! We are causing irreparable harm to the earth’s climate and its physical and biological systems – including warming and acidification of the oceans as well as rising sea levels – processes that have already begun and will not be possible to reverse even if humans stop burning fossil fuels today.
So all we can do is slow the rate of change and help those most likely to be affected to prepare for the worst. It’s the least we can do.
The League of Conservation Voters has a continually updated report “In Own Words” on each remaining 2016 presidential candidates’ past statements on climate change . Non of the candidates statements reflect the study on sea level rise released last week.
A Day to Remember – February 29, 2016
I could not allow this day – Feb. 29 – to pass without comment. Leap year – a year having an extra day in February – occurs only every four years.
So, is that good or bad?
It’s not good, in fact it’s DISASTROUS, because yet ANOTHER day, and year, and decade has gone by while our elected officials in the State of Wisconsin Legislature, and the U.S. Congress, and the population of our state and country, refuse to take the threat, and now reality, of global warming caused by too much fossil fuel burning – in cars, trucks, airplanes, electric power producing plants that burn fossil fuels, seriously, despite alarming increases in sea levels.
Too much fuel burning primarily coal, methane (natural gas), and oil products, have been burned by humans over the past decades and centuries for the energy that has been produced, resulting in the emission and accumulation of elevated concentrations of “greenhouse gases” in earth’s atmosphere, resulting in global warming, the rise in the elevation levels of earth’s oceans, due to the melting of the earth’s Arctic and Antarctic Circle’s land ice and snow, the shrinking of earth’s mountainous glaciers, a thawing of the earth’s permafrost region (one-fifth of the earth’s land surface), causing a warming, expansion, and acidification of earth’s oceans, leading to a dangerous rise in sea level.
The warming is already wreaking of havoc on earth’s biological systems, including humans, most notably in poorer, tropical countries, many of which are already experiencing grave losses due to extreme weather events, such as drought, heat waves and severe storms, along with unprecedented flooding, all of which had been scientifically predicted well over a century ago!
The warming has been compounded by the increasing loss of vegetation, particularly the loss of the tropical rainforests, which had been naturally sequestering carbon dioxide from the atmosphere, but not anymore, by the ones which have been replaced by other forms of development or money producing mono-culture agriculture.
Global warming from human causes is not rocket science, despite what the flat earth believers may still be claiming. However, saying that human-caused global warming is not occurring, because it has not been “proven” to be happening – as of this February 29, 2016, is utterly preposterous, and those who claim human-caused global warming is not happening are either fools or worse yet – liars.
What is Wrong with Our People in Washington D.C.?
So what if the price of oil falls to its lowest point in 12 years! Our federal lawmakers in Washington already gave in to the oil industry by removing the 40-year old crude oil export ban, and now they are talking about expediting the process for exporting liquefied natural gas, subsidizing private infrastructure with U.S. taxpayer money including money for upgrading pipelines, transmission lines, rails and roads, to “help our industry compete” by allowing energy to get to market “more quickly and cheaply” by “loosening environmental and other regulations”.
Our governmental officials in Washington D.C. say they will work towards continuing and giving more U.S. taxpayer money to reward already wealthy companies like ExxonMobil and other highly profitable energy companies who have already profited greatly with the U.S. Government financial assistance over a number of decades with ill effects on millions of us already, and many more millions of us who will be so unfortunate as to succeed us on a planet rocked by ever increasing and ever more deadly extreme weather tragedies, that is, of course, if they manage to keep their heads above earth’s rising ocean levels, which have submerged some island countries already. Exxon’s own scientific studies predicted all these bad things would result if humans continued to recklessly burn more and more fossil fuels for energy, sending the concentrations of many greenhouse gases, such as carbon dioxide and methane to evermore dangerous levels in our Earth’s atmosphere, oceans and water bodies. Yet still they kept their research to themselves, hiding the many catastrophic consequences of global warming, and funded global warming denial campaigns, which allowed them to continue to enrich themselves at the world and future world’s expense!
Where is the justice in all of this? There isn’t any. Not here, there or anywhere. And certainly not in the chambers in Washington D.C.. Change has got to come, now, before it’s too late. And it has to be the RIGHT kind of change – the equitable kind. It has to be a change that will help all of us who currently and in the future call Earth our home. There is no other hospitable place we can go.
Our Representatives and Senators in Washington D.C. need to wake up to the scientific reality that confronts all of us – that we have already exceeded the safe level of heat trapping gases in the atmosphere. Not only must we stop adding more and more greenhouse gases to the atmosphere, but we must also accept the moral responsibility of helping those likely to be hurt the most by Earth’s rising seas and other adverse and compounding realities stemming from human-caused changes in the climate, especially those who can least afford appropriate adaption measures that will allow them to humanely live with the changes, particularly those who have contributed the least to the problem that now confronts us all.
Those presently in Washington D.C. who are continuing to act as though the threats and costs of global warming and climate change resulting from human activity are nonexistent should go do something else.
President Obama Should Request U.S. Congress to Issue Declaration of War to Fight Global Warming
On December 8, 1941, the United States Congress declared war on the Empire of Japan in response to its surprise attack on Pearl Harbor, the United States naval base at Pearl Harbor in the U.S. Territory (soon to become state) of Hawaii the morning of December 7, 1941.
The Declaration of War was formulated an hour after President Franklin D. Roosevelt’s famous Infamy Speech at 12:30 pm on December 8, 1941. The declaration quickly passed the Senate and then the House at 1:10 p.m the same day. Roosevelt signed the declaration at 4:10 p.m., December 8, 1941. The power to declare war is assigned exclusively to Congress in the United States Constitution; however, the president’s signature was symbolically powerful and resolved any doubts.
Two days later, a similar war declaration against Germany and Italy passed both the Senate and the House of Representatives.
In the Joint Resolutions declaring war against the Imperial Government of Japan, Germany and Italy, the Congress pledged “all the resources of the country of the United States” … “and the president is hereby authorized and directed to employ the entire naval and military forces of the United States and the resources of the government to carry on war … to bring the conflict to a successful termination.”
The magnitude of the threat of accelerating global warming and a rapidly changing climate that would undeniably accompany the continued and increasing accumulation of greenhouse gases in the atmosphere, as a direct consequence of human actions, mainly from too much fossil fuel burning and continuing and increased deforestation, especially in the tropics, upon the United States of America and the rest of the world, both now and into the future, easily dwarfs the loss of life, injury and misery to humans and animals wrought by all known wars, and therefore justifies a declaration of war by all countries of the world to slow and ultimately halt global warming and climate change, worldwide. Such declarations should be made now, without delay, to ensure an hospitable and safe world for all Earth’s current and future generations.
It is morally essential that Government, businesses, individuals and families begin to meet this challenge of increasing global warming and climate change that has already begun to cause loss of human lives, other species living in the world, and brought pain and misery to so many. To ignore and campaign against actions that reduce this growing threat, which will unquestionably hurt the people of the world’s poorer countries and Earth’s millions and millions of species, is utterly and morally reprehensible and is a practice that ought stop immediately because it needlessly delays progress in attacking this major problem of untold negative consequences for centuries to come.
Catastrophic Climate Change and National Security
World faces catastrophic climate change unless it takes action, National Security Adviser Susan Rice tells Stanford University audience 12 October 2015
Selected Remarks by National Security Adviser Susan E. Rice on Climate Change and National Security at Stanford University, October 12, 2015: [Full Text of Speech]
… In 1985—fall quarter of my senior year—scientists from around the world met to express concern that a buildup of greenhouse gasses, and specifically carbon dioxide, would result in “a rise of global mean temperature…greater than any in man’s history.” By 1990, the Intergovernmental Panel on Climate Change issued its first report, detailing how a warming climate would affect our ecosystem. There have since been four more reports, each with more sophisticated science to support ever more dire warnings.
So, it’s not that we didn’t see climate change coming. It’s that for the better part of three decades we failed, repeatedly, to treat this challenge with the seriousness and the urgency it deserves. As an international community, we succumbed to divisive global politics that set developing countries against industrialized nations and stymied international consensus on climate change.
At home, we succumbed to divisive domestic politics that allowed entrenched interests to push a calculated agenda of doubt, denial, and delay. And, we focused, quite understandably, on other critical national security priorities—from coming to grips with globalization, halting proliferation, and above all, keeping the American people safe in a post-9/11 world….
We are seizing opportunities and meeting challenges head on. And, today, we face no greater long-term challenge than climate change, an advancing menace that imperils so many of the other things we hope to achieve. That’s why, under President Obama, we have put combating climate change at the very center of our national security agenda….
In the past 15 years, we’ve had 14 of the hottest years on record—which is exactly the kind of change those climate scientists back in 1985 suggested we could be seeing by now. Last year, 2014, was the hottest. And, scientists say there’s a 97 percent chance that we’ll set a new record again this year. The seas have risen about eight inches over the past 100 years, and they’re now rising at roughly double the rate they did in the 20th century. Arctic sea ice is shrinking. Permafrost is thawing. The Antarctic ice shelf is breaking up faster than anticipated. Storms are getting stronger. Extreme precipitation events are becoming more frequent. Heat waves are growing more intense. The bottom line is this: we’re on a collision course with climate impacts that have inescapable implications for our national security. Let me sketch out a few of them.
First, climate change is a direct threat to the prosperity and safety of the American people. We’re losing billions of dollars in failed crops due to extreme drought. Millions of acres of forest have been lost to fire. In addition to longer fire seasons and drier summers here in the West, on the East Coast we’re seeing record rain events. Last week in the Carolinas, unprecedented amounts of rain fell—enough in just five days to put a serious dent in California’s multi-year drought. And, while we can’t say that climate change is the direct cause of any specific weather event, these are exactly the trends that we expect to see more of, if climate trends continue on their current trajectory.
Along our coasts, we’ve got thousands of miles of roads and railways, 100 energy facilities, communities of millions—all of which are vulnerable to sea-level rise. Remember Super Storm Sandy—how it hobbled America’s largest city and plunged everyone south of 34th Street into darkness for days? We saw a cascading failure of infrastructure. Water flooded an electrical substation, and backup power was either flooded or insufficient. Over 6,000 patients had to be evacuated from powerless hospitals down stairwells. Transportation broke down, because you can’t pump gas without electricity. Wastewater treatment plants shut down. One critical sector pulled down other vital systems. And, with warmer oceans and higher seas, New York City will have to be prepared for Sandy-level flooding to happen every 25 years.
When I visited Alaska with President Obama last month, we saw rapidly disappearing glaciers and a native community whose island home is already being washed away. The question for them is not if they will have to abandon their traditional homes and way of life, but when. These are real threats to our homeland security, and they’re happening now.
Second, climate change will impact our national defense. We’ve got military installations that are imperiled by the same rising seas as our civilian infrastructure. Here in the western United States, ranges where our troops train are jeopardized by heat and drought. In fact, this summer we had to cancel some training exercises, because it got too hot.
Climate change means operating in more severe weather conditions, increasing the wear on both service members and their equipment. There will also be new demands on our military. A thawing Arctic means 1,000 miles of Arctic coastline and new sea lanes to secure. Around the world, more intense storms—like the massive typhoon that decimated part of the Philippines two years ago—will mean more frequent humanitarian relief missions. And, our military will have to deal with increased instability and conflict around the world.
That’s a third major national security concern, because climate change is what the Department of Defense calls a “threat multiplier”—which means, even if climate change isn’t the spark that directly ignites conflict, it increases the size of the powder keg. A changing climate makes it harder for farmers to grow crops, fishermen to catch enough fish, herders to tend their livestock—it makes it harder for countries to feed their people. And humans, like every other species on this planet, scatter when their environment can no longer sustain them. As the Earth heats up, many countries will experience growing competition for reduced food and water resources. Rather than stay and starve, people will fight for their survival.
All of these consequences are exacerbated in fragile, developing states that are least equipped to handle strains on their resources. In Nigeria, prolonged drought contributed to the instability and dissatisfaction that Boko Haram exploits. The genocide in Darfur began, in part, as a drought-driven conflict. In the years prior to civil war breaking out in Syria, that country also experienced its worst drought on record. Farming families moved en masse into urban centers, increasing political unrest and further priming the country for conflict. In fact, last year, a Stanford research group determined that a rise in temperature is linked with a statistically significant increase in the frequency of conflict. There is already an unholy nexus between human insecurity, humanitarian crises, and state failure—climate change makes it that much worse.
Around the world, more than 100 million people now live less than one meter above sea level—including entire island countries in the Caribbean, the Pacific and the Indian Oceans. Consider the impacts—to the global economy and to our shared security—when rising seas begin to swallow nations whole.
Fourth, we face spreading diseases and mounting threats to global health. Already, more mosquito-borne diseases are spreading from the tropics to temperate zones as climates warm. Viruses like West Nile and Chikungunya are growing more prevalent in the United States. India is currently in the grip of the worst dengue fever outbreak in years. Livestock diseases are expanding northward into Europe. These advancing diseases cost billions of dollars a year to treat and contain, not to mention the immeasurable cost in human lives and suffering.
Finally, we cannot dismiss the worst-case predictions of catastrophic, irreparable damage to our environment. If the Greenland ice sheet melts, seas could rise not just the one to four feet many scientists predict, but eventually as much as 20 feet. If the oceans continue to acidify, it will devastate the marine coral reefs, compromising the food chain, and imperiling a major source of protein for 3 billion people worldwide.
These aren’t marginal threats. They put at risk the health and safety of people on every continent.
NASA: Sea Level Rise of Several Feet is UNAVOIDABLE!
[Tide gauges have been used to measure sea level for more than 130 years. Satellite measurements now complement the historical record. (NASA Earth Observatory image by Joshua Stevens, based on data from the Commonwealth Scientific and Industrial Research Organization and NOAA)]
For thousands of years, sea level has remained relatively stable and human communities have settled along the planet’s coastlines. But now Earth’s seas are rising. Globally, sea level has risen about eight inches since the beginning of the 20th century and more than two inches in the last 20 years alone. According to the federal National Aeronautics and Space Administration (NASA), “all signs suggest that this rise is accelerating”.
Seas around the world have risen an average of nearly 3 inches since 1992, with some locations rising more than 9 inches due to natural variation, according to the latest satellite measurements from NASA and its partners. An intensive research effort now underway, aided by NASA observations and analysis, points to “an unavoidable rise of several feet in the future”.
“Sea level rise is a natural [physical] consequence of the warming of our planet”, states NASA’s press release dated August 26, 2015. “We know this from basic physics. When water heats up, it expands. So when the ocean warms, sea level rises. When ice is exposed to heat, it melts. And when ice on land melts and water runs into the ocean [water from unprecedented ice and snow melt off Antarctica, Greenland, land areas north of permafrost region in Northern Hemisphere, mountainous glaciers receding, worldwide] sea level rises”.
As the ocean has warmed, polar ice has melted, and porous landmasses have subsided, global mean sea level has risen by 8 inches (20 centimeters) since 1870. The rate of sea level rise is faster now than at any time in the past 2,000 years, and that rate has doubled in the past two decades.
While NASA and other agencies continue to monitor the warming of the ocean and changes to the planet’s land masses, the biggest concern is what will happen to the ancient ice sheets covering Greenland and Antarctica, which continue to send out alerts that a warming planet is affecting their stability.
NASA has been recording the height of the ocean surface from space since 1992, recording about 2.9 inches (7.4 centimeters) of sea level rise averaged for all the oceans in that 23 year period.
In 2002, NASA and the German space agency launched the Gravity Recovery and Climate Experiment (GRACE) twin satellites, capable of measuring the movement of mass, hence gravity, around Earth at intervals of every 30 days. GRACE has found that earth’s land masses move very little in a month; however, earth’s water masses move through melting, evaporation, precipitation and other processes. GRACE records these movements of water around the planet, while a new NASA network of more than 3,000 floating ocean sensors spread across the entire open ocean supplement that ocean water level data.
Observations from the new NASA ocean level data collection systems have revolutionized scientists’ understanding of contemporary sea level rise and its causes. NASA’s newest release state that: “We know that today’s sea level rise is about one-third the result of the warming of existing ocean water, with the remainder coming from melting land ice”, adding that “currently, regional differences in sea level rise are dominated by the effects of ocean currents and well known cycles, such as the Pacific Ocean’s El Niño phenomenon and the Pacific Decadal Oscillation.” But as the ice sheets located closer to the poles of the planet (which receive less direct solar radiation due to the tilting of the planet as it orbits the Sun), and the once “permanent” ice located at higher elevations around the world continues to melt as a direct result of measurably warming temperatures occurring as a direct consequence of a stronger greenhouse effect that is already unnaturally high due to human activities such as fossil fuel burning, deforestation, and paving over the earth’s still green landscape. NASA scientists now predict that the increasing meltwater resulting from the stronger greenhouse effect will overtake the formerly natural causes of regional variations of the ocean water levels and be the most significant contributor to the overall rise in sea level.
The recent advances in observing the world’s frozen regions using satellite measurements from NASA and its participating organizations have allowed scientists to accurately estimate annual ice losses from Greenland and Antarctica. Not only can they now determine how much sea level around the world is changing – as measured by satellite for the past 23 years – but they can also determine how much of the sea level rise is being caused by our warming of the earth’s biosphere, which includes both the atmosphere at or near the surface, the oceans, the land surface, and the biota (plant and animal kingdoms) that all together comprise earth’s biosphere.
GRACE’s record, spanning over the last decade, shows that the ice loss around the planet is now accelerating in Greenland and West Antarctica. The record shows Greenland has shed on average 303 gigatons of ice every year since 2004, while Antarctica has lost on average 118 gigatons of ice per year. Much of Antarctica’s ice loss has been shown to come from West Antarctica’s ice loss. Greenland’s ice loss has accelerated by 31 gigatons of ice per year, every year since 2004, while West Antarctica’s ice loss has accelerated to 28 gigatons per year.
“Given what we know now about how the ocean expands as it warms and how ice sheets and glaciers are adding water to the seas, it’s pretty certain we are locked into at least 3 feet of sea level rise and probably more,” said Steve Nerem of the University of Colorado, Boulder, and lead of NASA’s new Sea Level Change Team.
The Greenland Ice Sheet, spanning 660,000 square miles (an area almost as big as Alaska), and with a thickness at its highest point of almost 2 miles, has the potential to raise the world’s oceans by more than 20 feet. Situated in the Arctic, which is warming at twice the rate of the rest of the planet, Greenland has been shedding more ice in the summer than it gains back in the winter since 1992.
“In Greenland, everything got warmer at the same time: the air, the ocean surface, the depths of the ocean,” said Ian Joughin, a glaciologist at University of Washington. “We don’t really understand which part of that warming is having the biggest effect on the glaciers.”
What scientists do know is that warming Arctic temperatures – and a darkening surface of the Greenland ice sheet – are causing so much summer melting that it is now the dominant factor in Greenland’s contribution to sea level rise.
NASA has found that Greenland’s summer melt season now lasts 70 days longer than it did in the early 1970s. Every summer, warmer air temperatures cause melt over about half of the surface of the ice sheet – although recently, 2012 saw an extreme event where 97 percent of the ice sheet experienced melt at its top layer.
Greenland’s massive glaciers have sped up, too. Though many of the glaciers in the southeast, west and northwest of the island – an area that experienced quick thinning from 2000 to 2006 – have now slowed down, the melting rate at other areas Greenland’s massive ice sheet has not slowed. A study last year showed that the northeast Greenland ice stream had increased its ice loss rate due to warmer air temperatures.
“The early 2000s was when some big things revealed themselves, such as when we saw the fastest glacier we knew of, the Jakobshavn ice stream in Greenland, double its speed,” said Waleed Abdalati, director of the Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, and former NASA chief scientist. “The subsequent surprise was that these changes could be sustained for a decade – Jakobshavn is still going fast”, Abdalati said.
The Antarctic Ice Sheet covers nearly 5.4 million square miles, and area larger than the United States and India combined, and contains enough ice to raise the ocean level by about 190 feet. The Transantarctic Mountains split Antarctica in two major regions: West Antarctica and the much larger East Antarctica.
Though Antarctica’s contribution to sea level rise is still at less than 0.02 inches (0.5 millimeters) per year, several events over the past decade and a half have prompted experts to start warning about the possibility of more rapid changes this century.
The mountainous horn of the continent, the Antarctic Peninsula, gave one of the earliest warnings on the impact of a changing climate in Antarctica when warm air and warmer ocean temperatures led to the dramatically fast breakup of the Larsen B ice shelf in 2002. In about a month, 1,250 square miles of floating ice that had been stable for over 10,000 years were gone. In the following years, other ice shelves in the Peninsula, including the last remainder of Larsen B, collapsed, speeding up in the flow of the land lying glaciers that they were buttressing against the warming ocean.
In 2014, two studies focusing on the acceleration of the glaciers in the Amundsen Sea sector of West Antarctica showed that its collapse is currently well underway. And while one of the studies speculated that the demise of the ice overlaying West Antarctica could take as long as 200 to 1,000 years, depending on how rapidly the ocean heats up, both studies concurred that its collapse is already unstoppable, and that when it does collapse, the melt water will add up to 12 feet of sea level rise to the oceans.
The wind is also a factor in determining the timing of West Antarctica’s collapse. The “westerlies”, the winds that spin the ocean waters around Antarctica, are known to have intensified during the last decade, pushing the cold top layer away from the land, and thus allowing the warmer, deeper waters to rise and spill over the border of the continental shelf, flowing all the way back to the base of many of the ice shelves jetting out from the continent. As the ice shelves weaken from underneath, the glaciers behind them are predicted to speed up.
East Antarctica’s massive ice sheet, as vast as the lower continental U.S., remains an unknown in projections of sea level rise. Though it appears to be stable, a recent study on Totten Glacier, East Antarctica’s largest and most rapidly thinning glacier, hints otherwise. Research found two deep troughs that could lead warm ocean water to the base of the glacier and melt it in a similar way to what’s happening to the glaciers in West Antarctica. Other sectors grounded below sea level, such as the Cook Ice Shelf, Ninnis, Mertz and Frost glaciers, have also been found to be losing mass.
For the West Antarctic Ice Sheet, which largely rests on a bed that lies below sea level, the main driver of ice loss is the ocean. The waters of the Southern Ocean are layered: on top and at the bottom, the temperatures are frigid, but the middle layer is warm. The westerlies, the winds that spin the ocean waters around Antarctica, have intensified during the last decade, pushing the cold top layer away from the land. This allows the warmer, deeper waters to rise and spill over the border of the continental shelf, flowing all the way back to the base of many ice shelves. As the ice shelves weaken from underneath, the glaciers behind them speed up.
East Antarctica’s massive ice sheet, as vast as the lower continental U.S., remains the main unknown in projections of sea level rise. Though it appears to be stable, a recent study on Totten Glacier, East Antarctica’s largest and most rapidly thinning glacier, hints otherwise. The research found two deep troughs that could lead warm ocean water to the base of the glacier and melt it in a similar way to what’s happening to the glaciers in West Antarctica. Other sectors grounded below sea level, such as the Cook Ice Shelf, Ninnis, Mertz and Frost glaciers, are also losing mass.